If the customer wishes to be onsite during the cleaning and/or inspection visit, please be advised that our arrival windows vary by 30 minutes. For example, the arrival window would be 8:00AM to 8:30AM. There are many things that can cause the schedule to change, such as cancellations, traffic etc. If we happen to be running late to the appointment, we will be contacting you as soon as possible with an updated estimated time of arrival.